METHOD OF PRODUCTION OF WATER-SOLUBLE FOILS

Object of this solution is a method of production of water- -soluble foils on the base of a modified polyvinylalcohol with a different water solubility. The foils are produced by blowing technology so that polyvinylalcohol is dosed into a rotating feed worm placed in a heated chamber. Behind a coole...

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Bibliographische Detailangaben
Hauptverfasser:	BENC GABRIEL, CERVINKOVA DANICA, VARGA ALEXANDER, SKUBLA PAVOL
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Object of this solution is a method of production of water- -soluble foils on the base of a modified polyvinylalcohol with a different water solubility. The foils are produced by blowing technology so that polyvinylalcohol is dosed into a rotating feed worm placed in a heated chamber. Behind a cooled input zone material is rapidly heated up to 200-240 degrees of Celsius, then the temperature of the zones gradually decreases up to a nozzle, where the temperature is 170-210 degrees of Celsius; next, melt is extruded through a circular nozzle, cooled by air and blow to a required size. After folding, the foil passes through a climatizing chamber and then is winding. Water soluble polyvinylalcohol foils can be used for special applications in health service, chemical industry, for food packing and alike.